Concrete-mixer.



T. L. SMITH.

CONCRETE MIXER.

APPLICATIUN FILED Au'mw.

Patented July "27, 1915.

3 SHEETS-SHEET I w/ TNESSES.

fi TTORNE Y3- T. L. SMITH.

CONCRETE MIXER. APPLICATION FILED Aue.19, 1909.

- Patented July 27, 1915.

3 SHEETSSHEET 2.

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T. L. SMITH.

' CONCRETE MIXER.

APPLICATION FILED AUG. 19, 1909.

Patented Jul 27, 1915.

a SHEETS SHEET 3.

' VENTW THOMAS L. SMITH, OF MILWAUKEE, \VISCOINSIN'.

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- companying drawings, which are apart of this specification.

My invention relates to. improvements in devices for mixing concrete in which a batch of the proper proportion of the ingredients to be mixed is introduced to the mixing device and discharged therefrom before another batch in introduced, and the objects of my invention are to provide a device that will require only a small application of power to efficiently mix the ingredients so that the machine may be actuated by hand to provide a devicethat shall be readily portable, that can be made at'a reasonable cost and willbe durable and efficient in every way.

With the above and other incidental objects in view, the invention consists in the devices or their equivalents as set forth in the following specification.

Figure 1 is a side view of the device one of the wheels being removed. Fig. 2 is a rear view of the-machine, as it appears by looking at Fig. 1 from the right.- Fig. 3 is a central longitudinal section of the mixing receptacle or drum taken on the vertical lane 1-1 of Fig. 1 and line 11 of Fig. 4. Fig. 4 is an inverted plan view of the receptacle as seen by looking upward at Fig. 1 apart of the spout being broken away to show the construction. Fig. 5 is a side view of a modified form of hand mixer embodying the same mixing principle. Fig. 6 is a plan view of the same and Fig. is a central longitudinal section through Fig. 6 on the line 2-2.

The device or machine of the preferred form comprises broadly a mixing receptacle, rotatably supported in a portable frame. The frame comprises a pair of legs 3. 4. at each end of the drum, these legs being joined together at the top in each pair to form an inverted V and being tied together part way of the height of the V by cross bars 5 and 6. These two V shaped frames are tied together at the top by a member 7 extending longitudinally of the drum, and at the lower end 3. 3. by a member 8. The two legs 4. 4. are-tied together by cross bars 9. 9. The

Specification of Letters Patent.

Application filed August 19, 1509. Serial No. 514,012.

wheels 11. 11, and as the Patented July 27, 1191.5.

legs 3. 3. carry boxes .in which an axle or shaft 10, extending longitudinally of the drum is journaled,-which shaft carries the legs 3. 3. are supported clear of the ground by these wheels 11, the entire frame is rendered portable by lifting the front legs 4. 4. clear of the ground.

- A shaft 12 is journaled in boxes 13, 13, at the top of the frame and sprocket wheels 14, 14,.are secured on this shaft. The drum 15 is supported in chains. 16, 16,.which engage the sprocket wheels 14, 14. The chains are kept in place on each end of the drum or receptacle 15 by a channeled'ring 17, which 15 bent around and secured to the drum 15. The drum is held from swinging in any direction by fourrollers 18 which are journaled on pins projecting from the bars 5, 5.

The cylindrical shell of the drum projects beyond the heads thereof see Fig. 3, and the .rollers 18 engage inside of this projecting portion andflanges on the rollers engage the edge thereof.

A shaft'19 passes freely through the center of the drum along its axis ofrotation and is journaled in boxes 21 on the bars 5. This shaft is squared at both ends to receive crank I handles 20, and it also carries the sprocket 22 to the bars 6, and inclined runways 27 may be hooked over these angle irons as in Fig. 2.

The drum or mixing receptacle 15 is mainly cylindrical in form, but the plate formin this cylindrical shell is cut away within its outer edges from 28 to 29, that is, through a space of 90 degrees, see Fig. 1 and Fig. 4, to form the opening from the spout 30 to the interiorof the drum. The outer edges of the shell, however, are not cut away, but are left to form a complete circle, at each end where the channels 17, 17, and the spout 30 are attached, see'Fig. 4.

Each head of the drum, see Fig. 3, is formed with two strips 31, which are at right angles to the cylindrical shell and two strips 32 which are bent at an angle to the strips 31 to form a wedge like body projecting into the drum. The inner ends of the strips 32 of each head meet to form an edge 33, which might be termed the lip of 110 means of a slot like openin drum, passes through the lips 33, is flanged circle in Fi 1. During the receptac e, the materlal 1s constrained by out against and riveted to the planes 32, thus forming a longitudinal opening through the drum for the crank shaft 19.

In operation, the machine is placed over the spot where the concrete is wanted, the 1nclined runways 27 are hooked in place, and the drum or receptacle is partial y rotated into the position shown in 1. The material to be mixed is wheeled to the platform 25, dumped into the spout 30, and the proper proportion of water is thrown in. All this material runs into the lower compartment 34, and then by means. of the crank and chain gearing shown the drum is revolved through about 180 degrees from left to right, the spout moving through the upper semithis movement of gravity to flow through the constriction 35, from one compartment 34 to the other. The material slides down the curved shell of the receptacle and at the same time it is forced by the weight of material above it alon the inclined planes 32 as it all moves towar the slot 35. Thus two portions of material which start from'positions contiguous to the two end planes 31 will eventually be forced into each other and into intervening ortions as they pass through the slot 35; he motion of the cranks is then reversedand the drum again swung to the position shown in Fig. 1, during which return movement the material again passes through the slot 35. After one repetitionof this oscillation the material is sufficiently mixed and on the last oscillation the movement is continued long enough to swing the spout 30 under the bottom of the drum, and the mixed batch of concrete is discharged on the ground. The machine is then moved along a few inches and another batch is mixed and dumped. As soon as the concrete is uncovered by the machineit is spread and tamped.

The drum may be easily a hose.

In the modified device shown in Figs. 5, 6, and 7 the mixer is intended to be rocked or oscillated on the ground instead of being partially rotated back and forth as in the washed out with first form. This mixer consists of a trough or open topped box having a curved bottom 40 and ends 41. 41. tangential to the curve of the bottom. A false bottom 42 may be placed in the trough or may be omitted.

43. 43. are two removable doors one at each end of the trough, held in place by' small cleats 44. Inclined-planes 45. 45. are attached to both sides of the trough and meet each other forming angular edges 46. These edges 46 are in the sameplane transverse of the mixer and thus constricted opening 47 is formed extendin vertically to the bottom 42. 48 are hand es of-any convenient form by which the device may be rockedback and I and the mixer is rocked back and forth in such manner that the entire batch of material slides along the inclined planes 45 and through the constricted opening 47 into the low compartment of .the mixer. This mixing action is precisely the same as in thepreferred form. When the batch is sufliciently mixed, the'mixer is, blocked with one end depressed the door 43 at the lower end is removed and the concrete shoveled out.

What I claim as my invention is:

1. In a concrete mixer, a mixing receptacle havin two chambers -merging' with each other in a slot like connecting open ing extending across the receptacle, the walls of the chamberscontiguous to the slot being inclined toward each other, and means for oscillating the receptacle.

cle, means rotatably supporting said receptacle, said receptacle consisting of a substantially cylindrical shell havin V shaped heads projectin into, the same om opposite ends thereo the edges of the angles of.

3. In a concrete mixer a rotatably mounted mixing receptacle comprising a plurality of chambers having an mtercommu'nicatinf slot like opening extending transversely 'o andintersecting the axis of rotation of the receptacle, each chamber being situated en.-

tirely to one side of the axis of rotation. 4. In a concrete mixer, a rotatably mounted mixing receptacle having a pair of chambers which merge and form a slot-like opening substantially transverse to the axis of rotation of the receptacle each chamber formed by the shell of the receptacle and wedge shaped heads which close the ends of the receptacle, the points of the wedges being parallel, opposed to each other, and spaced apart to form said slot like opening, each chamber being on one side of said axis,

whereby, as the receptacle is rotated the 100 2. In a concrete mixer, a mixer recepta- I contained material will slide along said inclines and be forced through said slot.

5. In a concrete mixer a rotatable mixing receptacle, sheet metal plates in said receptacle inclined to the axis of rotation ofthe receptacle and to each other in pairs, each pair of plates intersecting and terminating in parallel lines radial of the receptacle, said intersections being separated fromeach other to form a comparatively narrow opening through which the material placed in the receptacle will be forced by the rotation thereof.

6. In a concrete mixer, a rotatably mounted mixing receptacle consisting of a shell extending around the axis of rotation and Wedge shaped heads in said shell having the edges of the Wedges extending into the shell and disposed opposite to each other.

7. In a concrete mixer, a mixing receptacle comprising a cylindrical shell and heads closing the ends of said shell, a part of said shell being cut away to'aflord a feed and discharge opening, and inclines within said shell extending from said heads opposite to each other and transverse to the axis of the receptacle.

8. A concrete mixer comprising a rotatafeed and discharge opening between said heads.

9. In a concrete mixer, a IIllXlIlg receptacle rotatably mounted, means forming a plurality of chambers in said receptacle and means forming a slot like opening between said chambers extending radially relatively to the axis of rotation, the walls of the chambers contiguous to the slots being inclined toward each other.

10. A concrete mixer comprising a cylindrical rotatable drum, heads closing the ends of said drum, a shelf extending from each head inclined toward and transverse to the drums axis, 'said shelves being opposite each other and spaced apart to afford an opening therebetween transverse to the axis of the drum.

11. A concrete mixer comprising a cylindrical rotatable drum, heads in the ends of said drum, an inclined plane extending from each head toward the drums axis and toward the medial plane of the drum, said planes being opposite to each other and spaced apart to afford an opening therebetween transverse to the axis.

In testimony of which, I hereunto aflix my hand in the presence of two witnesses.

THOMAS L. sMITri. 

